Barking-drum



H. GUETTLER.

BARKING DRUM.

Patented July 29, 1919.

% h Jg u no Illlll anvem/toz ll WI fiereri 'uetfiler UNITED STATES PATENT orrro.

HERBERT GUETTLER, or CHICAGO, rumors, ASSIGNOR TO amrmrcan raaxme DRUM COMPANY, A CORPORATION or ILLINOIS.

BARKING-DRUM.

Specification a Letters Patent.

Patented July 29, 1919.

To all whom it may concern:

Be it known that I, HERBERT Gunman,

a subject of the King of Norway, residing at Chicago, in the county of Cook, State of Illinois, have invented certain new and useful Improvements in Barking-Drums; and I do hereby declare the following to be a full, clear, and exact description of the in vention, such as will enable others skilled in the art to which it appertains to make and use the same.

The present invention relates to bark removing machines of the type wherein' the blocks of wood, from which the bark is to be removed, are tumbled in a rotating drum. The improvements comprising the invention reside in the provision, within the drum, of devices for effecting the required tumbling action constructed in such a way as to completely avoid brooming or similar injury, which is liable to occur when tumbling devices of the usual character are employed.

According to the invention, as preferably carried into practice, the drum is made up of rolled steel bars, which extend from end to end thereof and are formed with continuous longitudinal corrugations. The latter occupy the central portions only of the bars, and project inwardly toward the.

axis of the drum; and they are disposed suiliciently far apart from one another, due to their formation as just described, to provide an interrupted 'or pocketed,'instead of a practicallysmooth, interior surfacewithin the drun Consequently, when the drum is in motion and the tumbling of the wood takes place, no injury tothe wood will be occasioned, because of the fact that the ends of the blocks will strike against the rounded corrugations, instead of against the sharp edges of the ordinary tumbling devices. The pieces of bark detached in this way from the blocks are discharged from the interior of the drum through longitudinal slots which are produced by spacing the ed es of adjacent bars.

n embodiment of the invention is illustrated in the accompanying drawing, wherem Figure 1 is a side elevation of a barking drum equipped with the present improvements; Fig. 2 is a transverse section thereof; and Fig. 3 is an enlarged, fragmental perls)pective view of some of the corrugated ars.

Referring more particularly to said drawing, the improved drum, generally designated 5, is preferably cylindrical in shape, as shown, and is made up of skeleton metal bars 7 which extend from end to end thereof and are connected together by a plurality of metal hoops 6 arranged at suitable intervals apart. These bars are constructed of rolled steel, and are provided with longitudinal corrugations 13, which constitute the tumbling devices proper, said corrugations being co-extensive in length with the bars and occupying solely the central portions thereof, so that they are spaced from the marginal edges of the bars. The corrugations project inwardly toward the lon gitudinal axis of the drum, and are of rounded or U-section; and they are disposed an appreciable distance apart from one another, due to their central arrangement on the bars as above explained, inorder to pr vide an interrupted, instead of a practically smooth, interior surface, thereby insuring the positive tumbling of the blocks. The bars themselves have their mutually-adj acent longitudinal or marginal edges spaced far enough apart to form slots 8, through which the detached pieces of bark may be discharged into the tank or the like (not shown) wherein the drum is mounted. The interruptions above referred to are in the nature of longitudinal pockets which are sufliciently wide to enable them to catch the corners of the blocks therein during the rotation of the drum, whereby the blocks are positively forced to travel part way around -with the drum. The slots 8 extend centrally along the bottoms of the pockets.

The drum is supported by means of devices which alternate with the hoops 6 and are here shown as comprising pairs of angle iron hoops 9 arranged with their flights projecting outwardly from the drum and disposed opposite and in close proximity to each other to receive between them solid rings 10, the latter and the flights of the hoops being riveted together, while the bases of the hoops are secured in like manner to the corrugated bars 7. The rings 10 may rest upon or otherwise engage rollers or other supports of any desired character, illustration of this feature being omitted as not involved in the actual invention. Rotation of the drum may likewise be effected in any approved manner; for instance, by providm at the center of the drum a sprocket ring 11 which encircles said drum and is deslgned for en agement with driving gearing (not shown which in turn, is'driven from a suitable source ower, the said sprocket rin being mounted between the out turned flig ts of a pair of angle iron hoops 12.

The devices for tumbling the blocks of wood comprise the afore-mentioned, in-

wardly-directed corrugations 13, which are so arated far enough apart to insure their e ecting the necessary tumblin action, as

above explained, as distinguis ed from a mere sliding movement of the blocks; but

instead of the ends of the blocks striking against the tumbling devices (which areusually in the form of angle bars havin their flights directed inwardly of the drum and being split or broomed by the sharp edges thereof, they will hit only the rounded surfaces of thecorrugations, and will, in

consequence, be uninjured.

Further description ofthe invention, its

mode of operation, and its advantages, is

deemed unnecessary inview of the foregoing, and'is,'accordingly, omitted; but it may be stated that while the preferred embodis ment of the invention is dlsclosed herein, no limitation to the precise structural details of such disclosure is intended, since modifications and changes with relation to .the improved tumbling devices may well be made within the scope of the invention as claimed, and the said devices may obviously be used in other and different types of drums.

base directed inwardly toward the center of the drum, said devices being spaced an appreciable distance apart from one another so as to form pockets between them adapted to catch the corners of the blocks therein during the rotation of the drum and thereby positively force said blocks to travel part way around with said drum.

'3. In a barking apparatus, a hollow, rotatable drum comprising a plurality of skeldistance apart from one another to form pocketsbetween them adapted'to catchthe corners ofthe blocks therein during the rotation of the drum and thereby positively force said blocks to travel part way around with said drum.

'4. In 'a barking apparatus, a hollow, rotatable container for the blocks, comprising a plurality of bars having longitudinal corrugations which are directed inwardly to ward the center of the container.

5. A barking drum comprising a plurality of longitudinally corrugated bars which extend from endto end, thereof in parallel relation, the corrugations of said bars being directed inwardly toward the axis of the drum. v

6. A barking drum comprising a plurality of longitudinally corrugated bars which extend from end to end thereof in parallel relation, the corrugations of said bars occupying solely the central portions thereof and being directed inwardly toward the axis of the drum, so as to provide an interrupted tumbling surface within the drum.

7. A barking drum comprising a plurality of bars formed with continuous longitudinal corrugations which are spaced from the marginal edges of the bars and are directed in- 'w'ardly toward the axis of the drum so as to provide an interrupted tumbling surface within the drum, the said edges of adjacent bars being spaced apart to provide longitudinal slots for the discharge of detached pieces of bark therethrough.

8. A barking drum' comprising a plurality of bars formed with continuous longitudinal projections of substantially U-section which are spaced from the marginal edges of the bars and are directed inwardly toward the axis of the drum so as to provide an interrupted tumbling surface within the drum. 1

9. A barking'drum comprising a plurality of bars formed with continuous longitudinal projections of substantially U-section which are spaced from the marginal edges of .thebars and are directed inwardly toward the axis of the drum so as to provide an interrupted tumbling surface within the drum, the said edges of adjacent bars being spaced apart toprovide longitudinal slots for the discharge of detached pieces of bark therethrough.

In testimony whereof I affix 11g signature. HERBERT TTLER. 

